Unicycle frame



FIG. 1 is a perspective view of a unicycle frame showing my new design; it being understood that the broken lines are for illustrative purposes only;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is an enlarged side elevational view thereof;

FIG. 4 is an enlarged top plan view thereof; and

FIG. 5 is an enlarged bottom plan view thereof. 

The ornamental design for a unicycle frame, as shown and described. 